Furnace-grate construction



0. P. NYSTROM.

FURNACE GRATE CONSTRUCTION.

APPLICATION FILED MAY 10. 191B.

1 ,332, 353 Patented Mar. 2, 1920.

2 SHEETSSHEET I.

Q5545? A4149 from f @M O. P. NYSTROM. FURNACE GRATE CONSTRUCTION.

APPLICATION FILED MAY I0, IQI B.

Patented Mar. 2, 1920.

2 SHEETS-SHEET 2.

IIIIIIIIIIHR //71/e/7fo/ 0800/1? 877 0? 7 7'7 ne a g I UNITED STATESPATENT OFFICE.

OSCAR P. NYSTROM, OF HOLLAND, MICHIGAN, ASSIGNOR T0 HOLLAND FURNACECOMPANY, OF HOLLAND. MICHIGAN, A CORPORATION OF MICHIGAN.

FURNACE-CRATE CONSTRUCTION.

Specification of Letters Patent.

Patented Mar. 2, 1920.

Application filed May 10, 1918. Serial No. 233,661.

To all whom it may concern:

Be it known that I, OSCAR P. NYs'rRoM, a citizen of the United States ofAmerica, residing at Holland, in the county of Ottawa and State ofMichigan, have invented certain new and useful Improvements in F urnace-Grate Constructions; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to a novel grate construction for furnaces. Aprimary object and purpose of this invention is to provide, in a gratefor furnaces, means for mounting the grate between the furnace firepotand the ash-pit, together with a means for actuating the grate such thata combined rotary and oscillating movement of the grate is obtained, thesame being particularly effective to shake down the ashes and clinkersinto the ash pit. Another object of the invention is to provide a novelmeans for mounting the grate such that it may be very easily applied andremoved, while at the same time the construction permits a tilting ofthe grate so that the entire contents of the fire-pot may be dumped atany time into the ash pit, the grate being so mounted as to bepractically balanced and requiring little or no effort in carrying outthis dumping movement. A further object of the invention is to provide ameans for holding the grate in its normal operative position which is ofsimple and novel character, and one which is very easily accessible fordisconnection at any time that it is desired to dum the contents of thefire-pot into the ash pit. Many other objects and purposes together withnovel constructions for attaining the same, and directed particularly toan extremely simple, effective, and economical grate construction, willappear as the description of the invention progresses, reference beinghad to the accompanying drawings showing a preferred constructionembodying the invention, in which 1 Figure l is a perspective view, withparts broken away and shown in section, of the furnace ash pit, and baseconstruction forming a part of the structure of my invention.

*ig. 2 is a longitudinal vertical sectlon taken therethrough.

Fig. 3 is a side elevation, partly in sectlon, of the grate, supportingbar therefor and operating mechanism for actuating the same.

Fig. 4 is a front elevation of the assembled grate structure and ashpit.

Figs. 5 and 6 are, respectively, enlarged front and plan views of thegrate supporting bar, and

Fig. 7 is an enlarged view of the oscillating hook with which the grateoperating rod is detachably associated.

Like reference characters refer to like parts in the several views ofthe drawings.

In the construction an ash pit, preferably, of cast iron is providedhaving cylindrical vertical walls 1 from which, at the front sideprojects an extension comprising vertical walls 2 connected at theirupper edges by a top wall 3, the ash pit back of the top having an openupper side in which the grate is mounted below the furnace fire-pot aswill be understood by all familiar with furnace construction. Atdiametrically opposed points near the upper edges of the vertical. walls1 of the ash pit, inwardly extending sockets A are cast, having open upper sides adapted to receive the ends of a grate supporting bar as willhereafter appear. From the top 3 an eye member 5 depends, the same beingcast integral with said top. A hook member 6 having upper and lowerhooks 7 and 8 is suspended from the eye 5, the upper hook 7 being ofsmaller size than the lower hook and passing through the eye ofmember'5, it being apparent that the member 6 has a free swingingmovement and may be turned to various positions with respect to the top3 from which it is suspended.

A grate supporting bar 9 is adapted to be received at its ends in thesockets 4E and supported a distance above the bottom of the ash pit. Theends 10 of the bar 9 are fashioned to enter the open sockets 4E,shoulders 11 being provided to preclude anyilongitudinal movement of thebar with respect to the ash pit. At its middle point and on the upperside of the bar a tapered projection or post 12 is cast, the sameextending and tapering upwardly as shown.

The grate 13 is of circular type having various slots and openings forthe passage of ashes. The grate tapers upwardly to ward its center. Onthe under side of the center of the grate a socket la is made, adaptedto loosely receive the upper end of the post 12, while a lug 15 is castintegral with and depends from the front side of the grate, it having ahorizontal opening therethrough through which a tubular rod 16 mayloosely pass, the same also .being adapted to enter the open upper sideof the hook 8 whereby the rod is supported in substantially horizontalposition. At its outer end this rod is equipped with a handle 17.

In operation the handle 17 may be grasped and the grate turned back andforth about the vertical axis of the post 12 imparting a-circular motionthereto, while at the same time the hooked member 6 is turned back andforth about member 5 causing a progressive elevation of the handle toeach side of its central lowermost position. It is evident that not onlyis a rotary back and forth motion given to the grate, but that it isprogressively tilted and oscillated about the axis of the post 12simultaneously with the rotary movement. This is a very effective actionto stir and dislocate ashes and clinkers from the grate causing the sameto drop through into the ash pit; and particularly as the outer edges ofthe grate are raised and lowered with respect to the firepot which islocated above the ash pit, thus causing any clinkers which gravitate tothe outer edges of the grate to be worked out between the outer edges ofthe grate and the fire-pot.

If at anytime it is desired to dump the entire contents of the fire-pot,all that is necessary is to disconnect the rod 16 from the hook 8letting the forward side of the grate'tilt downwardly, while the rearside moves in an upward direction, the bar 9 turning about a horizontalaxis as is obvious. It will be noted in this connection that the grateis balanced with respect to the bar 9 and that to either raise or lowerthe same requires practically no effort. Furthermore, the hook member 6is centrally located at the front of the ash pit extension directlybehind the door (not shown) which normally closes the front side thereofand can be very readily operated by hand to disconnect rod 16 from thelowerhook 8, The hook member 6' may be readily connected to or removedfrom the eye 5 in certain positions thereof, the rod 16 is readilyremovable from the grate, the grate may be lifted easily off of thepost12, while the bar 9 may be connected with or removed from thesockets4 without the use of any tools of any kind, this permitting a very quickand economical assembling of the parts or a ready replacement of thesame should any of? the parts become burnt, out onotherwise rendereduseless. .All of these features,v of utility, together with the extremesimplicity of construction and the minor number of parts needed, renderthe grate construction one of great value. And particularly thecombinedrotary and oscillatory movements which may simultaneously begiven to the grate, make the com struction one of particular efiiciencyfor furnaces.

Various changes in detail of construction may be resorted to withoutdeparting from the invention and accordingly, I do not wish to belimited to the exact specific con struction shown and described, butconsider myself entitled to all modifications of structure fallingwithin the-scope of the appended claims defining the invention.

1 claim: v

1. Incombination, a furnace ash pit hav ing an open'top, a frontextension thereto having a closed top, socket members projectinginwardly from opposite sides of the ash pit, a bar provided with acentral vertical upwardly tapered post loosely mounted and seated at itsends in said socketmembers, a circular grate having a socket on itsunder side positioned over the bar, the up per end of the post looselyentering said socket on the grate, said grate at its front side beingprovided with a downwardly extending lug having a horizontal openingtherethrough, an eye-member depending from the top of the ash pitextension, a hook member formed with open hooks at both ends pivotallysuspended from said eyemember, one hook passing loosely through the eyeof said member, and an operating rod passing loosely through the frontdepending lug on the grate and detachably received and held by the lowerhook of said hook member, substantially as described.

2. In combination, a furnace ash pit having an open top, a frontextension thereto having aclosed top, a socket member located one ateach side of the ash pit, a bar pivotally mounted at its ends in saidsocket members, said bar having a central vertial post, a circular grateprovided with a central socket 011 its under side located over the bar,the upper end of the post loosely entering the socket, a memberdetachably and pivotally connected to and depending from the top of theextension, said member having a hook at the lower end thereof, and anoperating rod detachably connected atits rear end with the grate andreceived and held between its ends by said hook, substant'ially asdescribed. 7

3. In combination, a furnace ash pit having an open top, a frontextension thereto having a closed top, a bar pivotally mounted to turnon a horizontal axis between the sides of the ash pit, said bar havingacentral upwardly extending post, a grate provided with a central socketon its under side loosely mounted on the post, the upper end of the postentering the-socket; a member pivotally connected to and depending fromthe top of said ash pit extension, said member at its lower end beingformed with a hook, and a rod connected at its rear end with the grateand detacha'bly received and held by said hook at a point between itsends, substantially as descrlbed.

4. In combination, a furnace ash pit having an open top, a frontextension thereto having a closed top, a bar positioned horizontallyacross, and mounted to turn on a horizontal axis between the sides ofthe ash pit, a grate mounted on and above the bar to turn freely andtilt partially about a vertical axis located substantially midwaybetween the ends of the bar, a member pivotally connected to andsuspended from the top of the ash pit extension, nd an operating rodconnected at its rear end to the front part of the grate and detachablyconnected between its ends to the lower end of said member.

5. In combination, a furnace ash pit having an open top, a barpositioned horizontally across the ash pit and mounted to turn on ahorizontal axis between the sides of the ash pit, a centrally locatedpost on the bar extending upwardly therefrom, a grate having a centrallypositioned socket on its under side located above the bar with the upperend of the post loosely entered into the socket, an operating rodattached to the grate and extending forwardly therefrom, and meanspivotally mounted above the rod with which the rod has detachableengagement at a point below its point of pivotal mounting whereby saidrod may be swun from side to side about the pivot of sai means,substantially as described.

6. In combination, a furnace ash pit having an open top, a barpositioned horizontally across, and mounted to turn about a horizontalaxis between the sides of the ash pit, a grate mounted on the bar toturn about a vertical axis, and means to turn the grate back and forthabout said vertical axis, and simultaneously tilt the grate slightlywith respect to said vertical axis, said means being detachable andserving to hold the grate in substantially horizontal position,substantially as described.

7. In combination, a furnace ash pit having an open top, a bar locatedhorizontally across the open end of the ash pit and mounted at its endson the sides of the ash pit to turn about a, horizontal axis, a circulargrate rotatably mounted above and on the bar to turn about a verticalaxis, an operating rod connected at its rear end to the front part ofthe grate, and means to detachably and pivotally support said rod at apoint above the rod and between its ends whereby it may be oscillatedback and forth from side to side, or permitted to drop to tilt the grateabout the horizontal axis of the bar, substantially as described.

8. In combination, an ash pit having an open upper side, a grate locatedin said open upper portion of the ash pit, means for mounting the grateso that the same may turn about a vertical axis and simultaneously tiltthe grate slightly with respect to said vertical axis, and means foroperating the grate to turn it about said vertical axis andsimultaneously tilt it with respect to the said vertical axis, theturning and tilting movements taking place at the same time and byoperation of said means, substantially aS described.

In testimony whereof I have aflixed my signature.

OSCAR P. NYSTROM.

